Accepting request 228070 from home:jsmeix:branches:Printing

Added beh the Backend Error Handler

OBS-URL: https://build.opensuse.org/request/show/228070
OBS-URL: https://build.opensuse.org/package/show/Printing/cups-backends?expand=0&rev=12

COPYING

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
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beh

@@ -0,0 +1,205 @@
+#!/usr/bin/perl
+# The above Perl path may vary on your system; fix it!!! -*- perl -*-
+
+# beh - Backend Error Handler
+
+# A wrapper for CUPS backends to make error handling configurable
+
+# Usually, if a CUPS backend exits with an error status other than zero
+# (for example if a printer is not turned on or not reachable on the
+# network), CUPS disables the print queue and one can only print again
+# if a system administrator re-enables the queue manually. Even restarting
+# CUPS (or rebooting) does not re-enable disabled queues.
+#
+# For system administrators this can get annoying, for newbie users
+# who are not aware of this problem it looks like that CUPS is severely
+# broken. They remove and re-install print queues, getting on the nerves
+# of distro install support, people, or even switch back to a proprietary
+# operating system.
+#
+# This script makes the handling of such backend errors configurable, so
+# that the problem can easily be worked around. The new possibilities are:
+#
+#  - Let queues simply not being disabled. Simple approach, but job gets 
+#    lost.
+#
+#  - Repeat a given number of times.
+#
+#  - Repeat infinitely often, until the job gets finally through. This
+#    is the standard of LPRng, and it eliminates loss of the job.
+#
+#  - The interval between two attemts to run the backend can also be
+#    configured.
+#
+#  - Configuration is done independently for each print queue. So local
+#    printers and network printers can be treated differently.
+
+# Save this file in your CUPS backend directory, usually
+# /usr/lib/cups/backend/ or /usr/local/lib/cups/backend/
+#
+# Mark this filter world-readable and world-executable. Restart CUPS to
+# make the new backend known to the spooler.
+#
+# See http://www.openprinting.org/cups-doc.html and the additional
+# instructions below.
+
+# beh - Backend Error Handler
+#
+# Copyright 2005 Till Kamppeter <till.kamppeter@gmail.com>
+#
+#  This program is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License as published by the
+#  Free Software Foundation; either version 2 of the License, or (at your
+#  option) any later version.
+#
+#  This program is distributed in the hope that it will be useful, but
+#  WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#  Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+#  USA.
+
+# Usage: 
+#
+# cp beh /usr/lib/cups/backend/
+# chmod 755 /usr/lib/cups/backend/beh
+# killall -HUP cupsd (or "/etc/init.d/cups restart")
+# lpadmin -p <queue name> -E -v beh:/<dd>/<att>/<delay>/<originaluri>
+#
+# with 
+#   <queue name>:     The name of your print queue
+#   <dd>:             Don't Disable, if "1", beh always exits with zero
+#                     status, so the queue gets never disabled when the
+#                     original backend exits with an error. "0" carries
+#                     the error status of the last call of the backend
+#                     (after <att> retries) on to CUPS, so the queue
+#                     usually gets disabled.
+#   <att>:            Attempts, number of attempts to recall the backend
+#                     in case of an error. "0" means infinite retries. In
+#                     this case <dd> gets meaningless.
+#   <delay>:          Delay between two attempts to call the beckend, to
+#                     be given in seconds and as an integer number.
+#                     Meaningless if <att> is one.
+#   <originaluri>:    The original URI, which your queue had before.
+#
+# All parameters, especially, <dd>, <att>, and <delay> have always to
+# be specified, even if one of them is meaningless due to the setting of
+# the others.
+#
+# beh works with every backend except the "hp" backend of HPLIP.
+#
+# Example URIs:
+#
+# beh:/1/3/5/socket://printer:9100
+#
+#   On the network printer with host name "printer" it is tried to access
+#   3 times with 5 second delays between the attempts. If the job still
+#   fails, the queue is not disabled (and the job discarded).
+#
+# beh:/0/10/60/socket://printer:9100
+#
+#   Retry 10 times in one minute intervals, disable the queue when still
+#   not succeeding.
+#
+# beh:/1/0/60/usb://Brother/HL-5040%20series
+#
+#   On a Brother HL-5040 on the USB try infinitely often until the printer
+#   comes back, in intervals of one minute. This way the job does not get
+#   lost when the printer is turned off and one can intendedly delay
+#   printing by simply switching off the printer. The ideal configuration
+#   for desktop printers and/or home users.
+
+# Acknowledgement
+# 
+# Thanks to Jeff Hardy (hardyjm at potsdam dot edu) for writing the
+# "accsnmp" wrapper backend (http://fritz.potsdam.edu/projects/cupsapps/). 
+# This backend showed me the trick how to write a universal wrapper 
+# backend in a scripting language.
+
+use strict;
+
+$0 =~ m!^(.*)/([^/]+)\s*$!;
+my $progname = ($2 || $0);
+my $progpath = ($1 || "/usr/lib/cups/backend");
+
+if (!$ARGV[0]){
+    print "network $progname \"Unknown\" \"Backend Error Handler\"\n";
+    exit 0;
+}
+
+if (scalar(@ARGV) < 5 || scalar(@ARGV) > 6){
+    print STDERR "ERROR: Usage: $progname job-id user title copies options [file]\n";
+    exit 1;
+}
+
+my ($jobID, $userName, $jobTitle, $copies, $printOptions, $printFile) = 
+    @ARGV;
+
+my $tempFile;
+if (!$printFile) { 
+
+    my $jid = $jobID;
+    my $uid = $userName;
+    $jid =~ s/\W//g; #sanity check
+    $uid =~ s/\W//g; #sanity check
+    my $tmpDir = $ENV{TMPDIR};
+    $tmpDir ||= "/tmp";
+    $tempFile = "$tmpDir/$jid-$uid-cupsjob$$";
+
+    open (OUT, ">$tempFile") or die "ERROR: Cannot write $tempFile: $!\n";
+
+    while(<STDIN>){
+	print OUT "$_";
+    }
+
+    close OUT;
+
+    $printFile = $tempFile;
+
+    # Backends should only produce multiple copies if a file name is 
+    # supplied (see CUPS Software Programmers Manual)
+    $copies = 1;
+
+}
+
+my $uri = $ENV{DEVICE_URI};
+$uri =~ m!^$progname:/(\d+)/(\d+)/(\d+)/(\S+)$! or
+    die "URI must be \"beh:/<dd>/<att>/<delay>/<original uri>\"!\n";
+my $dontdisable = $1;
+my $attempts = $2;
+my $delay = $3;
+$uri = $4;
+$uri =~ m!^([^:\s]+):!;
+my $backend = $1;
+$ENV{DEVICE_URI} = $uri;
+
+# Control by "lpr" command line options, commented out for security
+# reasons (user could intendedly make queues being disabled)
+
+#$printOptions =~ m/\bBackendErrorDisableQueue=(\S*)\b/ && 
+#    ($dontdisable = ($1 =~ /no/i ? 1 : 0));
+#$printOptions =~ m/\bBackendErrorRetries=(\S*)\b/ && ($attempts = $1);
+#$printOptions =~ m/\bBackendErrorRetryDelay=(\S*)\b/ && ($delay = $1);
+#$printOptions =~ m/\bBackendErrorRetryForever=(\S*)\b/ &&
+#    ($delay = ($1 =~ /yes/i ? 0 : $delay));
+
+my $exitvalue;
+while($exitvalue = (($uri !~ m!^file:(.*)$!) && ($uri !~ m!^(/.*)$!) ?
+		    system {"$progpath/$backend"}
+		    ($uri, $jobID, $userName, $jobTitle, $copies,
+		     $printOptions, $printFile) :
+		    system ("cat $printFile > $1")) >> 8) {
+    if ($attempts > 0) {
+	$attempts --;
+	last if $attempts == 0;
+    }
+    sleep $delay if $delay > 0;
+}
+
+unlink $tempFile if $tempFile;
+
+$exitvalue = 0 if $dontdisable;
+exit $exitvalue;

cups-backends.changes

@@ -1,3 +1,19 @@
+-------------------------------------------------------------------
+Fri Mar 28 10:36:08 CET 2014 - jsmeix@suse.de
+
+- Added 'beh' the Backend Error Handler.
+  Since cups-filters version 1.0.42 foomatic-rip's upstream home
+  is moved from the foomatic-filters package to cups-filters and
+  foomatic-rip is provided in the cups-filters-foomatic-rip RPM.
+  The foomatic-filters package also contained 'beh' but that was
+  not moved into cups-filters.
+  Since hereby /usr/lib/cups/backend/beh is provided by both
+  cups-backends and foomatic-filters now cups-backends conflicts
+  with foomatic-filters.
+  As a result foomatic-filters is now obsolete and
+  for foomatic-rip cups-filters-foomatic-rip should be used and
+  for 'beh' cups-backends should be used.
+
 -------------------------------------------------------------------
 Mon Feb 13 10:45:34 UTC 2012 - coolo@suse.com
 

cups-backends.spec

@@ -1,7 +1,7 @@
 #
 # spec file for package cups-backends
 #
-# Copyright (c) 2012 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -20,29 +20,53 @@ Name:           cups-backends
 Summary:        Additional Backends for CUPS
 License:        GPL-2.0
 Group:          Hardware/Printing
-Version:        1.0
+Version:        1.1
 Release:        0
-Source0:        cups-pipe.sh
+Source0:        pipe
+Source1:        http://www.openprinting.org/download/files/beh
+Source100:      COPYING
 Requires:       cups
+# Conflict with foomatic-filters because /usr/lib/cups/backend/beh is provided by it.
+# Instead of foomatic-filters now cups-filters-foomatic-rip should be used.
+# Because cups-filters-foomatic-rip provides the RPM capability "foomatic-filters"
+# there cannot be an unversioned conflict with foomatic-filters here
+# (otherwise cups-backends would conflict with cups-filters-foomatic-rip).
+# Because cups-filters-foomatic-rip provides at least "foomatic-filters = 4.0.17.256.1"
+# (see cups-filters.spec) and because we will not upgrade the foomatic-filters package
+# (its current version is 4.0.12) a conflict with foomatic-filters < 4.0.17.256 is used
+# to let cups-backends only conflict with the old foomatic-filters package
+# but not with the new cups-filters-foomatic-rip package:
+Conflicts:      foomatic-filters < 4.0.17.256
+# According to RPMLINT:
+# "The package should be of the noarch architecture because it doesn't contain any binaries."
+BuildArch:      noarch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
 This package contains free additional backends for CUPS.
 
 %prep
-# There is nothing to do here because Source0 is installed directly from RPM_SOURCE_DIR.
+# There is nothing to do here because Source0 and Source1 are installed directly from RPM_SOURCE_DIR.
 
 %build
-# There is nothing to build because Source0 is a bash script.
+# There is nothing to build because Source0 is a Bash script and Source1 is a Perl script.
+# At least test if the syntax is o.k.:
+bash -n ${RPM_SOURCE_DIR}/pipe
+perl -c ${RPM_SOURCE_DIR}/beh &>/dev/null
 
 %install
 mkdir -p $RPM_BUILD_ROOT/usr/lib/cups/backend
-install -m 755 -D ${RPM_SOURCE_DIR}/cups-pipe.sh $RPM_BUILD_ROOT/usr/lib/cups/backend/pipe
+# Source0: cups-pipe.sh
+install -m 755 ${RPM_SOURCE_DIR}/pipe $RPM_BUILD_ROOT/usr/lib/cups/backend/pipe
+# Source1: beh
+install -m 755 ${RPM_SOURCE_DIR}/beh $RPM_BUILD_ROOT/usr/lib/cups/backend/beh
 
 %files 
-%defattr(-, root,root)
+%defattr(-,root,root,-)
+%doc ${RPM_SOURCE_DIR}/COPYING
 %dir /usr/lib/cups
 %dir /usr/lib/cups/backend
 /usr/lib/cups/backend/pipe
+/usr/lib/cups/backend/beh
 
 %changelog

pipe

@@ -1,8 +1,11 @@
 #! /bin/bash
 # CUPS wrapper backend "pipe" for printing to any program.
 # It forwards the print job data like a pipe into another command.
-# Author: Johannes Meixner <jsmeix@suse.de>, 2009
+# Author: Johannes Meixner <jsmeix@suse.de>, 2009, 2014
 # For basic information see "man 7 backend" and "man 7 filter".
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU GENERAL PUBLIC LICENSE Version 2
+# as published by the Free Software Foundation.
 
 # Activate the "set -x" line to get debugging info in /var/log/cups/error_log:
 #set -x